Table Of Contents - Komatsu WA900-3E0 Shop Manual

Failure code [D1ERKB] (Ladder raise solenoid output ground fault)................................... 40- 18
Failure code [D1ERKZ] (Ladder raise solenoid output abnormality:
Open circuit, hot short circuit)................................................................................... 40- 19
Failure code [D1ESKB] (Ladder lower solenoid output ground fault) .................................. 40- 20
Failure code [D1ESKZ] (Ladder lower solenoid output abnormality:
Open circuit, hot short circuit)................................................................................... 40- 21
Failure code [DBL0KR] (Power ladder controller CAN-NET signal line open circuit) .......... 40- 22
Failure code [DBL0KT] (Non-volatile memory write error) ................................................... 40- 26
Failure code [DBL1KK] (Power Low Error: Battery direct) ................................................... 40- 27
Failure code [DBL2KK] (Solenoid Power Low Error) ........................................................... 40- 29
Failure code [DDB6KZ] (Parking brake system abnormality) .............................................. 40- 31
Failure code [DDDGKY] (Ladder operation switch hot short circuit).................................... 40- 33
Failure code [DDDKKY] (Ladder raise operation switch hot short circuit) ........................... 40- 35
Failure code [DDDLKY] (Ladder lower operation switch hot short circuit) ........................... 40- 38
Failure code [DK5VKX] (Ladder angle sensor abnormality: Out of range) .......................... 40- 41
Failure code [DK5VMA] (Power ladder system abnormality)............................................... 40- 43
Failure code [DUM9KY] (Ladder indicator output hot short circuit) ..................................... 40- 46
Failure code [DUM9KZ] (Ladder indicator output abnormality: Open circuit, hot short circuit)40- 47
Failure code [DV00KY] (Ladder interlock caution output hot short circuit) .......................... 40- 48
Failure code [DV00KZ] (Ladder interlock caution output abnormality:
Open circuit, ground fault) ........................................................................................ 40- 49
Failure code [DWNLKA] (Ladder cushion valve output open circuit)................................... 40- 50
Failure code [DWNLKB] (Ladder cushion valve output ground fault) .................................. 40- 51
Failure code [DWNLKY] (Ladder cushion valve output hot short circuit) ............................. 40- 52
Troubleshooting of electrical system (E-mode)....................................................................... 40- 53
E-1 Power ladder does not operate ..................................................................................... 40- 53
E-2 Brake oil temperature warning keeps lighting ............................................................... 40- 56
E-3 Parking brake does not operate (as emergency brake) ................................................ 40- 58
E-4 Parking brake is applied while machine is traveling. ..................................................... 40- 62
E-5 Parking brake is released as starting switch is turned to ON position. ......................... 40- 65
Troubleshooting of hydraulic and mechanical system (H-mode) ............................................ 40- 67
H-1 Power ladder does not move or its speed is low........................................................... 40- 67
H-2 Fan of ADD cooler does not rotate ............................................................................... 40- 68
Troubleshooting of maintenance monitor system (K mode) ................................................... 40- 69
Maintenance monitor system............................................................................................... 40- 69
K-1 Hydraulic oil level gauge flashes................................................................................... 40- 71
Troubleshooting for machine monitor (M-mode)..................................................................... 40- 74
M-1 Rear view monitor does not operate............................................................................. 40- 74
M-2 While clearance lamp is turned on, illuminance of rear view monitor remains dark ..... 40- 77
M-3 Rear view monitor does not work in reverse-interlock mode ........................................ 40- 78
M-4 Illuminance of rear view monitor cannot be adjusted ................................................... 40- 80
M-5 Optional controller error and real-time monitor sreen are not displayed
on engine service monitor ........................................................................................ 40- 82
M-6 Engine compartment lamp does not light up ................................................................ 40- 84
M-7 Step lamp does not light up .......................................................................................... 40- 87
90 Diagrams and drawings
Hydraulic circuit diagram ........................................................................................................ 90-
Symbols used in hydraulic circuit diagram........................................................................... 90-
Power train hydraulic circuit diagram................................................................................... 90-
Brake, power ladder and additional cooler hydraulic circuit diagram................................... 90-
Work equipment hydraulic circuit diagram........................................................................... 90- 11
Electrical circuit diagram ......................................................................................................... 90- 13
Symbols used in electric circuit diagram.............................................................................. 90- 13
WA900-3E0

Table of Contents

3
3
7
9
00-3